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Mars, named after the Roman god of war, is the fourth planet from the sun.


Before the Great War, the United States Space Administration planned to launch a manned mission to Mars by July 2078, dubbed the Mars Shot Project. The project was delayed by a year due to unrest overseas, never reaching fruition before the war.[1] However, some continue to believe that the project was continued or even accelerated, with potential human habitation on Mars.[Non-canon 1]


  • At the Museum of Technology, a film named The Long Road to Mars is mentioned. A list of space facts mentions that a volcano on the planet, Olympus Mons, is the tallest known mountain in the Solar System, three times the height of Mount Everest.[2]
  • A model of the solar system appears at REPCONN headquarters, which includes a model of Mars.
  • In Fallout 4 and Fallout 76, issue #6 of Grognak the Barbarian has the hero facing off against Maula, the War Maiden of Mars. The villainess is also mentioned in a question on the Pioneer Scouts collector exam. It asks "Which villain was featured in issue #2 of Grognak the Barbarian?", with Maula provided as an incorrect answer.[3]
  • On Mothership Zeta, one of the abducted humans asked if a device on the ship was a Martian sex machine.[4]
  • The planet is mentioned in a question on the Pioneer Scouts metalworker exam. It asks "Brendan is learning to rivet. He learns that a fastened rivet has two "heads". It starts with and one, and the other is made during fastening. What do you call a rivet's second head?" "Martian head" is provided as an incorrect answer to the question.[5]
  • Vice President of the Enclave Daniel Bird claims that they have pictures of Mars that show canals and water on the planet's surface, which he believes means that there is also oxygen, so humans could breath on the planet.[6]
  • In the Hubris Comics and Toys board game The Legendary Run, the board is divided into three sections, the first of which is named "Mothmen of Mars." Additionally, the planet is depicted on the game board background.
  • The finale of The Adventures of Captain Cosmos television show was titled Captain Cosmos vs. the Giant Cockroach from Mars.[7] Additionally, the set for the finale was supposed to be the surface of the planet.
  • In 2077, after public outcry over a reporter being killed in a test of the XMB booster engine, the USSA attempted to garner support for the Mars mission by investing in the popular television show, The Adventures of Captain Cosmos.[8]


In Fallout cut dialogue, the Vault Dweller can could convince Jason Zimmerman that they are from the planet, "proving" it by showing him their firelance.Cut content[9]


Mars is mentioned in Fallout, Fallout 2, Fallout 3 and its add-on Mothership Zeta, Fallout: New Vegas, Fallout 4, its Creation Club content Captain Cosmos, and Fallout 76.



  1. ArcJet Systems terminal entries; CEO's terminal
  2. Far Out Space Facts!
  3. Pioneer Scout camp terminal entries; Pioneer badge exam terminal, Possum Exams, Collector
  4. Alien captive recorded log 2
  5. Pioneer Scout camp terminal entries; Pioneer badge exam terminal; Possum Exams, Metalworker
  6. Daniel Bird: "{164}{}{I think that maybe Mars would be nice because Mars is essentially in the same orbit... Mars is somewhat the same distance from the Sun, which is very important. We have seen pictures where there are canals, we believe, and water. If there is water, that means there is oxygen. If oxygen, that means we can breathe.}"
    (Daniel Bird's dialogue)
  7. Hub 360 terminal of entries; [G.Bennett] Season Finale Script
  8. CC-00 power armor loading screen: "The USAA-developed CC-1 Power Armor was used by Hubris Studios on the set of Captain Cosmos as part of a promotional stunt, hoping to kindle support for the failing Mars Shot Project." Creation Club
  9. Jason Zimmerman: "{102}{}{Hey, are you from really far away? Have you had a lot of adventures?}"
    The Vault Dweller: "{104}{}{Actually, I'm from Mars. Want to see my firelance?}"
    (JASON.MSG) Cut content
  1. Fallout: The Roleplaying Game Rulebook p.235: "Although most people either don’t know Mars Shot existed, or assume it was abandoned in the Great War, a few believe the project continued or was even accelerated. What, after all, would be a better move than to get off-planet in the days the planet almost died?

    It’s possible a few dozen or hundred humans live on Mars, in the lap of high-tech luxury, sparing their suffering Earthling brothers and sisters little thought. If that is so, it’s possible ArcJet’s deep-range transmitter could contact them for one reason or another."